CHICAGO, June 22, 2011 /PRNewswire/ -- Amended13D for RepliGen Corporation was filed with the SEC by Mr.Ronald L. Chez, a private investor.

Mr. Ronald L. Chez is the President of Ronald L. Chez, Inc., and a private investor.

RepliGen Corporation is a biopharmaceutical company focused on building an integrated company by developing and marketing innovative drugs that deliver the benefits of protein therapies in the fields of neurology and gastroenterology. RepliGen has a core competency in the development and manufacturing of biologics products, which is the basis for its bioprocessing business and RepliGen has out-licensed certain biologics intellectual property, which provide ongoing sources of revenue. Corporate headquarters are located at 41 Seyon Street, Waltham, Massachusetts 02453.

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